I'm also a dev from NZ, and I worked in the US a few years ago. Honestly it's not all it's cracked up to be, and I wouldn't choose to go back there. Trump didn't factor into that decision, but now it's even less enticing.
And I have Australian friends in the bay area now who are reconsidering which country they want their tax dollars to go to.
How have you found London? And where would you recommend a Perthian turned Melbourian dev head to if we have to go overseas to find ourselves?
I had a really bad experience with health care. In New Zealand, I never had to think twice about visiting the ER or hospital, where it's free, very high quality, and there's no long waits. In the US, a few trips to the ER including x-rays cost me something like ten thousand dollars, even after health insurance. My startup's plan might have not been great, but I understand why so many Americans go bankrupt from medical debt. I have a friend who went through cancer, which ended up costing millions of dollars. His family would have literally lost their home without the Affordable Care Act, which prohibits lifetime limits.
Having said that, I do like most things about San Francisco. There's some great food, great people, and so many things to do. It's a great place to live if you are wealthy. I wouldn't go back there as an employee or a startup founder, but maybe one day as an investor.